[custom_adv] Mass'oud Mirza Zell-e Soltan (1850 – 1918) or Massud Mirza was a Persian prince of the Qajar Dynasty; he was known as the "Yamin-al-Dowleh" ("Right Hand of the Government"). [custom_adv] He was posted as the governor of Isfahan for over 35 years, and the governor of the Mazandaran, Fars, and Isfahan for a total of 40 years. [custom_adv] He was the eldest son of Nasser-al-Din Shah and Effat-od-Dowleh, and the brother of Kamran Mirza Nayeb es-Saltaneh and of Mozzafar-al-Din Mirza (who eventually became Mozzafar-al-Din Shah), but Mas'oud Mirza could not ascend the throne because his mother not from the Qajar dynasty's family group. [custom_adv] At the age of thirteen he was appointed the governor of Mazandaran, Turkman Sahra, Semnan, and Damghan for four years.